.container{
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.btn{
  margin-bottom: 20px;
}
.card-enter, .card-appear{
  opacity: 0;
  transform: scale(.6);
  -webkit-transform: scale(.6);
  -moz-transform: scale(.6);
  -ms-transform: scale(.6);
  -o-transform: scale(.6);
}
.card-enter-active, .card-appear-active{
  opacity: 1;
  transform: scale(1);
  transition: all 300ms;
  -webkit-transition: all 300ms;
  -moz-transition: all 300ms;
  -ms-transition: all 300ms;
  -o-transition: all 300ms;
  -webkit-transform: scale(1);
  -moz-transform: scale(1);
  -ms-transform: scale(1);
  -o-transform: scale(1);
}
.card-enter-done, .card-appear-active{
  opacity: 1;
  transform: scale(1);
}

.card-exit{
  opacity: 1;
  transform: scale(1);
}
.card-exit-active{
  opacity: 0;
  transform: scale(.6);
  transition: all 300ms;
  -webkit-transition: all 300ms;
  -moz-transition: all 300ms;
  -ms-transition: all 300ms;
  -o-transition: all 300ms;
  -webkit-transform: scale(.6);
  -moz-transform: scale(.6);
  -ms-transform: scale(.6);
  -o-transform: scale(.6);
}
.card-exit-done{
  opacity: 0;
}